CN114532672B

CN114532672B - Degradable injection molding zipper and preparation method thereof

Info

Publication number: CN114532672B
Application number: CN202210350441.9A
Authority: CN
Inventors: 陈劲天; 陈晨; 陈芝帆
Original assignee: Wenzhou Richeng Zipper Co ltd
Current assignee: Wenzhou Richeng Zipper Co ltd
Priority date: 2022-04-02
Filing date: 2022-04-02
Publication date: 2023-06-23
Anticipated expiration: 2042-04-02
Also published as: CN114532672A

Abstract

The invention relates to the technical field of degradable zippers, in particular to a degradable injection molding zipper and a preparation method thereof, wherein the degradable injection molding zipper comprises a first cloth belt, a second cloth belt, a bolt and a square block, and the first cloth belt and the second cloth belt are symmetrically arranged; the square is fixedly connected to the bottom of the first cloth belt, and the bolt is fixedly connected to the bottom of the second cloth belt; the pull head is arranged above the square, the pull head is sleeved on the first cloth belt and is in sliding connection with the first cloth belt, the inner sides of the first cloth belt and the second cloth belt are provided with locking components for combining the cloth belts, and a locking mode is adopted to lock the locking components, so that gaps between zippers in a meshed state are avoided, the problem that external water leaks into the luggage case along the gaps between zipper teeth is solved, the possibility of dampness of articles in the luggage case is reduced, and the waterproof reliability of the luggage case is further improved; meanwhile, the closed luggage case is not easy to open the whole zipper under the action of external force, so that the theft prevention effect is improved.

Description

Degradable injection molding zipper and preparation method thereof

Technical Field

The invention relates to the technical field of degradable zippers, in particular to a degradable injection molding zipper and a preparation method thereof.

Background

The zipper consists of zipper teeth, a slider, an upper stopper, a lower stopper or a locking piece and the like, generally the zipper is provided with two chain belts, each chain belt is provided with a row of zipper teeth, the two rows of zipper teeth are staggered, the slider clamps the two side chain teeth, the zipper teeth on the two sides are meshed with or separated from each other by means of sliding the chain belts, and the zipper is widely applied to various fields such as aviation, military, medical treatment, civil use and the like as one of ten inventions which bring convenience to people's life recently;

in the civil field of zippers, the zipper is widely applied to clothing, tents, traveling cases and the like, particularly to traveling cases, and can greatly facilitate the opening and closing of the traveling cases and the use of the traveling cases;

however, in practical use, if the luggage in the suitcase is too much or not fixed stably in the process of carrying the luggage or dragging, more impact is caused to the meshing position of the zipper of the suitcase in the transportation process, a certain section of the zipper is not meshed and is broken, even the zipper is damaged, and if a certain section of the zipper is out of meshing, the closing state of the whole zipper can be directly influenced, which is also an important cause of the theft of many zipper type luggage cases, and an outsider can easily open the whole zipper by damaging any section of the zipper or the zipper, so that the theft is implemented.

In view of the above, the present invention provides a degradable injection molding zipper and a preparation method thereof, which improve the above technical problems.

Disclosure of Invention

The technical problems to be improved by the invention are as follows: when the suitcase is actually used, if the suitcase is loaded for transportation or towed, excessive or unfixed luggage in the suitcase can cause more impact to the zipper engagement position of the suitcase in the transportation process, the zipper can be broken even if a certain section of the zipper is out of engagement, and even the zipper is damaged, and if a certain section of the zipper is out of engagement, the closing state of the whole zipper can be directly influenced, which is also an important cause of theft of many zipper-type suitcases, and outsiders can easily open the whole zipper by destroying any section of the pull head or the zipper to realize theft.

The invention provides a degradable injection molding zipper and a preparation method thereof, wherein the degradable injection molding zipper comprises a first cloth belt, a second cloth belt, a bolt and a square block, and the first cloth belt and the second cloth belt are symmetrically arranged; the square is fixedly connected to the bottom of the first cloth belt, and the bolt is fixedly connected to the bottom of the second cloth belt; further comprises: the square is characterized in that a pull head is arranged above the square, the pull head is sleeved on a first cloth belt and is in sliding connection with the first cloth belt, locking components used for combining the cloth belts are arranged on the inner sides of the first cloth belt and the second cloth belt, and the inner shape of the pull head is C-shaped.

Preferably, the locking assembly includes:

a first tooth element; one end of the first zipper tooth is fixedly connected with a first cloth belt, and a plurality of first zipper teeth are arranged along the inner side of the first cloth belt;

a second element; one end of the second zipper tooth is fixedly connected with a second cloth belt, and a plurality of second zipper teeth are arranged along the inner side of the second cloth belt;

inserting and buckling; the eye-splice is arranged on the second chain tooth, penetrates through the second chain tooth and is in sliding connection with the second chain tooth;

a through hole; the through hole is formed in the first chain tooth.

Preferably, the eye-splice is also provided with an elastic component; the elastic assembly further comprises:

an elastic plate; one end of the elastic plate is fixedly connected with the eye-splice;

triangular protruding blocks; the triangular convex blocks are fixedly connected with the elastic plates.

Preferably, the end of the through hole is provided with a chamfer.

Preferably, a groove is formed in one end, far away from the second cloth belt, of the second chain element; one end of the first zipper tooth, which is far away from the first cloth belt, is fixedly connected with a bump.

Preferably, the upper surfaces of the first cloth belt and the second cloth belt are fixedly connected with protective layers, and the number of the protective layers is more than one.

Preferably, magnets are fixedly connected in the two protection layers, and the shapes of the magnets are respectively hemispherical and semi-arc.

Preferably, the surface of the convex block is fixedly connected with rubber.

Preferably, the triangular lug corner points are arc-shaped.

The zipper preparation method is suitable for the zipper composition, and the pull head, the first zipper tooth, the second zipper tooth, the eye-splice, the triangular lug and the lug are all made of PLA composite melting resin;

step S1: adding raw materials for preparing PLA composite molten resin into a melting furnace, mixing, melting and stirring, wherein the raw materials comprise PLA, POM and functional auxiliary agents, and the functional auxiliary agents comprise plasticizer, antioxidant and coupling agent to obtain PLA composite molten resin;

step S2: introducing the melted PLA composite melting resin into an injection molding machine, injecting the PLA composite melting resin into a die of the pull head, the first fastener element, the second fastener element, the eye-splice, the triangular lug and the protruding block by the injection molding machine, and cooling after injection molding is finished to obtain parts of the pull head, the first fastener element, the second fastener element, the eye-splice, the triangular lug and the protruding block;

step S3: and installing all the parts on the cloth belt to form a complete zipper shape.

The beneficial effects of the invention are as follows:

1. the invention provides a degradable injection molding zipper and a preparation method thereof, wherein a locking assembly is utilized to change the traditional closing mode of zipper teeth meshing, the zipper in the invention maintains the traditional opening and closing mode of the zipper, namely, the zipper teeth are closed and separated by pulling by a pull head, meanwhile, the zipper is opened and closed by attaching and separating a first zipper tooth and a second zipper tooth, the zipper is closed from the meshing of the zipper teeth to the attaching, a plurality of gaps exist between the zipper teeth when the traditional zipper teeth are meshed, the windproof and waterproof performances of the zipper are improved, and meanwhile, the whole zipper is not easy to be opened under the action of external force, so that the theft prevention effect is improved.

2. The invention provides a degradable injection molding zipper and a preparation method thereof, wherein the first zipper tooth and the second zipper tooth are attached, so that each pair of zipper teeth on the whole zipper can realize independent self-locking, namely, when a certain section or a pull head of the zipper is damaged, the closing state of the whole zipper is not influenced, and the stability of the zipper is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a schematic view of a zipper without a protective layer;

FIG. 3 is a front cross-sectional view of the zipper with the zipper not closed;

FIG. 4 is a cross-sectional view of the zipper after closure;

FIG. 5 is a cross-sectional view of a buckle;

in the figure: a first cloth belt 1, a second cloth belt 2, a bolt 3, a square 4, a pull head 5, a first fastener element 6, a second fastener element 7, a buckle 8, a through hole 9, an elastic plate 11, a triangular bump 12, a groove 13, a bump 14, a protective layer 15, a magnet 16 and rubber 17.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", and "longitudinal" are used interchangeably,

The positional or positional relationships indicated by "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., are based on the positional or positional relationships shown in the drawings, are merely for convenience in describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In order to better understand the above technical solutions, the following detailed description will be given with reference to the accompanying drawings and specific embodiments;

the invention provides a degradable injection molding zipper, which comprises a first cloth belt 1, a second cloth belt 2, a bolt 3 and a square 4, wherein the first cloth belt 1 and the second cloth belt 2 are symmetrically arranged; the square 4 is fixedly connected to the bottom of the first cloth belt 1, and the bolt 3 is fixedly connected to the bottom of the second cloth belt 2; the square 4 and the bolt 3 are in the prior art; further comprises: the top of square 4 is equipped with pull head 5, pull head 5 cover is located on No. 1 strap, and with No. 1 strap sliding connection, no. 1 strap and No. 2 inboard edges of strap are equipped with the locking subassembly that is used for merging the strap, the inside shape of pull head 5 is the C font.

The first cloth belt 1 and the second cloth belt 2 are respectively fixed around the opening and closing part of the suitcase;

when an operator needs to close the luggage case, the bolt 3 passes through one side of the pull head 5 far away from the first cloth belt 1 and moves downwards until reaching the bottom in the square 4, when the bolt 3 is immovable downwards in the square 4, namely the operator pinches the pull head 5 and lightly pulls along the track, the pull head 5 is taken as the center in the pulling process of the pull head 5, the first cloth belt 1 and the second cloth belt 2 shrink towards the center, and the locking components on the first cloth belt 1 and the second cloth belt 2 are mutually locked in the cloth belt shrinking process, so that the combination sealing between the first cloth belt 1 and the second cloth belt 2 is completed, the luggage case is closed and is not easy to collapse; even if a certain section of zipper can be opened under the action of external force (raised objects such as pen points, awls and the like), the whole zipper is not easy to open, so that the theft prevention effect is improved;

under the action of the locking component, external water (dew, rainwater and the like) cannot leak from the combination position of the first cloth belt 1 and the second cloth belt 2, so that the problem that articles in the luggage case cannot be polluted by external water in rainy and snowy weather or when the bottom surface is wet and slippery is solved;

compared with the traditional zipper, the zipper is closed by the way of meshing the zipper teeth at two sides, gaps exist between the meshed zippers, so that external water leaks along the gaps among the zipper teeth, and the zipper teeth are tightly attached by adopting the way of locking the zipper teeth by the locking component while the combination strength of the zipper is further improved, so that gaps among the zippers in the meshed state are avoided, the waterproof performance of the zipper is improved, the problem that external water leaks into the suitcase along the gaps among the zipper teeth is solved, the possibility of moisture of articles in the suitcase is reduced, and the waterproof reliability of the suitcase is further improved; meanwhile, the closed luggage case is not easy to open the whole zipper under the action of external force, so that the theft prevention effect is improved.

As an embodiment of the present invention, the locking assembly includes:

a first element 6; one end of the first fastener element 6 is fixedly connected with the first cloth belt 1, and a plurality of first fastener elements 6 are arranged along the inner side of the first cloth belt 1;

a second element 7; one end of the second zipper tooth 7 is fixedly connected with the second cloth belt 2, and a plurality of second zipper teeth 7 are arranged along the inner side of the second cloth belt 2;

a buckle 8; the eye-splice 8 is arranged on the second tooth element 7, and the eye-splice 8 penetrates through the second tooth element 7 and is in sliding connection with the second tooth element 7;

a through hole 9; the through hole 9 is formed in the first chain tooth 6;

as an embodiment of the present invention, the eye-splice 8 is further provided with an elastic component; the elastic assembly further comprises:

an elastic plate 11; one end of the elastic plate 11 is fixedly connected with the eye-splice 8;

triangular bumps 12; the triangular convex blocks 12 are fixedly connected with the elastic plate 11;

by adopting the technical scheme, the first zipper tooth 6 and the second zipper tooth 7 are symmetrically arranged; in the process of moving the pull head 5, the zipper teeth on the cloth belt shrink towards the center and penetrate through the interior of the pull head 5, and the zipper teeth coming out of the interior of the pull head 5 are combined with the zipper teeth; the C-shaped structure of the pull head 5 is utilized in the pull head 5, the first zipper teeth 6 and the second zipper teeth 7 on the cloth belt are close to the center in the pulling process of the pull head 5, at the moment, the right end face of the C-shaped pull head 5 is contacted with the inserting buckle 8 on the second zipper teeth 7 and extruded, and under the extrusion effect, the inserting buckle 8 on the second zipper teeth 7 moves towards the first zipper teeth 6;

simultaneously, the first zipper tooth 6 is also closed towards the second zipper tooth 7 under the action of the left end face of the C-shaped slider 5, in the process that the first zipper tooth 6 and the second zipper tooth 7 are closed, the inclined surface of the triangular lug 12 on the bottom of the elastic plate 11 on the second zipper tooth 7 is contacted with the through hole 9 on the first zipper tooth 6, the triangular lug 12 is extruded, and the triangular lug 12 contacted with the through hole 9 extrudes the elastic plate 11 along with the continuous closing of the first zipper tooth 6 and the second zipper tooth 7 towards the center, so that the extruded elastic plate 11 is deformed, namely the triangular lug 12 is closed towards the direction of the eye-splice 8; at the moment, the inserting buckle 8 can be inserted into the through hole 9 on the first chain element 6 and penetrates through the through hole 9, so that the first chain element 6 is attached to the inner surface of the second chain element 7;

after the bottom of the eye-splice 8 penetrates through the through hole 9 for a certain distance, the elastic plate 11 is restored to the original state from the deformed state under the action of the elasticity of the elastic plate 11, the triangular convex block 12 is restored to the horizontal state, at the moment, the triangular convex block 12 is a buckle to lock the first tooth 6 and the second tooth 7, the inner surfaces of the first tooth 6 and the second tooth 7 are further attached, and the possibility of leakage of external water from gaps between the teeth is further reduced;

when the suitcase is required to be opened, an operator holds the pull head 5 to pull in the reverse direction, and in the pulling process, the left end face of the C-shaped pull head 5 is contacted and extruded with the triangular lug 12 on one side of the first zipper tooth 6, so that the elastic plate 11 is extruded, and the elastic plate 11 is deformed; the triangular lug 12 is closed towards the eye-splice 8, and at the moment, the pull head 5 is pulled to separate the first zipper tooth 6 from the second zipper tooth 7, so that the eye-splice 8 is moved out of the through hole 9, namely the luggage case is opened, and the opening and closing operation of the luggage case is completed;

in this process, the element number one 6 and the element number two 7 serve as a pair of independent locking units,

firstly, under the cooperation of the eye-splice 8 and the through hole 9, the first zipper tooth 6 and the second zipper tooth 7 are tightly and firmly attached, so that the windproof and waterproof performances of the zipper are improved, and the zipper is not easy to collapse compared with the traditional zipper;

secondly, after each pair of first zipper teeth 6 and second zipper teeth 7 on the zipper are bonded and locked, the zipper is used as an independent locking unit, the zipper is not influenced by accidental collapse of the other first zipper teeth 6 and second zipper teeth 7 on the zipper, the bonding and locking state can still be kept, the locking stability of the zipper is improved, and meanwhile, the difficulty that an outsider can easily open the whole zipper by damaging any section of the pull head 5 or the zipper to carry out theft is greatly improved;

thirdly, the invention can directly draw out the pull head 5 after the zipper is closed, and the two ends of the zipper are not easy to be opened, so the invention can be used as an anti-theft mode to be applied to the anti-theft of the suitcase.

As one embodiment of the present invention, the end of the through hole 9 is provided with a chamfer;

by adopting the technical scheme, in the process of inserting the eye-splice 8 into the through hole 9, the eye-splice 8 is limited by the chamfer at the end part of the through hole 9, so that on one hand, the eye-splice 8 is parallelly embedded into the through hole 9, and the accuracy of the eye-splice 8 entering the through hole 9 is improved; on the other hand, the setting of chamfer has increased the area of contact of triangle lug 12 and through-hole 9 on eye-splice 8, makes things convenient for the embedding and the extrusion of triangle lug 12, and then improves elastic component's result of use.

As an implementation mode of the invention, a groove 13 is arranged at one end of the second fastener element 7 far away from the second cloth belt 2; one end of the first chain element 6 far away from the first cloth belt 1 is fixedly connected with a bump 14;

through adopting above-mentioned technical scheme, at the in-process that a chain tooth 6 and No. two chain teeth 7 shrink to the center, the lug 14 on a chain tooth 6 imbeds in No. two chain teeth 7's recess 13, and the fastening is No. one chain tooth 6 and No. two chain teeth 7, further makes No. one chain tooth 6 and No. two chain teeth 7 laminating, has reduced the probability that the dislocation appears or produce the gap and bring the seepage under the influence of external factor (artificial pulling, press etc.).

As an embodiment of the present invention, the protective layers 15 are fixedly connected to the upper surfaces of the first cloth belt 1 and the second cloth belt 2, and the number of the protective layers 15 is more than one;

through adopting above-mentioned technical scheme, when No. one chain tooth 6 and No. two chain teeth 7 merge, no. one strap 1 and No. two strap 2 draw close each other, and the inoxidizing coating 15 on No. one strap 1 and No. two strap 2 is contacted because of drawing close each other of strap this moment, forms one deck inoxidizing coating 15 outside No. 6 and No. two chain teeth 7, can block external water, has avoided external water and chain tooth direct contact, has further improved the waterproof performance of zip fastener.

As an embodiment of the present invention, the magnets 16 are fixedly connected in the two protection layers 15, and the shapes of the magnets 16 are respectively hemispherical and semi-arc;

through adopting above-mentioned technical scheme, when the inoxidizing coating 15 on strap 1 and the strap 2 of No. two contacts, the different name magnet in the inoxidizing coating 15 attracts each other, because the shape of magnet 16 is hemisphere and half arc respectively, make the hemispherical magnet laminating in one side inoxidizing coating 15 and the half arc magnet in the opposite side inoxidizing coating 15, avoided the condition that gap produced between the inoxidizing coating 15 to reduce the possibility that external water leaked from inoxidizing coating 15, further improved the waterproof windproof performance of zip fastener.

As one embodiment of the present invention, the surface of the bump 14 is fixedly connected with rubber 17;

through adopting above-mentioned technical scheme, at lug 14 surface fixed connection one deck rubber 17, make lug 14 and recess 13 inner wall increase friction, further make locking between element and the element, reduced and broken out the circumstances of opening because of external pulling force is great between element No. 6 and No. two element 7 in the use appear.

As one embodiment of the present invention, the triangular bump 12 has an arc-shaped corner;

by adopting the technical scheme, when the suitcase is in an open state, the triangular lug 12 on the eye-splice 8 is in an exposed state, and is too sharp relative to the traditional triangular corner, and under the exposed condition, an operator can stab the body part by the corner to cause damage when using the suitcase slightly without noticing;

the corner points of the triangular convex blocks 12 are arc-shaped, so that the damage of operators can be avoided under the naked state.

A zipper preparation method is suitable for the zipper composition, wherein the pull head 5, the first zipper tooth 6, the second zipper tooth 7, the eye-splice 8, the triangular lug 12 and the lug 14 are all made of PLA composite melting resin.

step S2: injecting the melted PLA composite melting resin into an injection molding machine, and injecting the PLA composite melting resin into the models of the pull head 5, the first fastener element 6, the second fastener element 7, the eye-splice 8, the triangular lug 12 and the lug 14 by the injection molding machine, and cooling after injection molding is finished to obtain parts of the pull head 5, the first fastener element 6, the second fastener element 7, the eye-splice 8, the triangular lug 12 and the lug 14;

step S3: each part is arranged on the cloth belt to form a complete zipper shape;

in the preparation process, the first zipper tooth 6 and the second zipper tooth 7 are reasonably large in size and volume under the condition that the use and the function exertion are not affected, and the manufacturing difficulty of the zipper is reduced.

Working principle:

when the pull head 5 is pulled, the zipper teeth on the cloth belt shrink towards the center and penetrate through the interior of the pull head 5 in the process of moving the pull head 5, and the zipper teeth coming out of the interior of the pull head 5 are combined with each other; the C-shaped structure of the pull head 5 is utilized in the pull head 5, the first zipper teeth 6 and the second zipper teeth 7 on the cloth belt are close to the center in the pulling process of the pull head 5, at the moment, the right end face of the C-shaped pull head 5 is contacted with the inserting buckle 8 on the second zipper teeth 7 and extruded, and under the extrusion effect, the inserting buckle 8 on the second zipper teeth 7 moves towards the first zipper teeth 6;

simultaneously, the first zipper tooth 6 is also closed towards the second zipper tooth 7 under the action of the left end face of the C-shaped pull head 5, in the process that the first zipper tooth 6 and the second zipper tooth 7 are closed, the inclined surface of the triangular lug 12 on the bottom of the eye-splice 8 on the second zipper tooth 7 is contacted with the through hole 9 on the first zipper tooth 6, the triangular lug 12 is extruded, the triangular lug 12 is closed towards the center along with the continuous closing of the first zipper tooth 6 and the second zipper tooth 7, and the triangular lug 12 contacted with the through hole 9 extrudes the elastic plate 11 at the moment, so that the extruded elastic plate 11 is deformed, namely the triangular lug 12 is closed towards the eye-splice 8; at the moment, the inserting buckle 8 can be inserted into the through hole 9 on the first chain element 6 and penetrates through the through hole 9, so that the first chain element 6 is attached to the inner surface of the second chain element 7;

when the first cloth belt 1 is contacted with the protective layer 15 on the second cloth belt 2, the different-name magnets in the protective layers 15 are attracted to each other, and as the shapes of the magnets 16 are respectively hemispherical and semi-arc-shaped, the hemispherical magnets in the protective layer 15 on one side are attached to the semi-arc-shaped magnets in the protective layer 15 on the other side, so that the situation of gaps between the protective layers 15 is avoided;

when the suitcase needs to be opened, an operator holds the pull head 5 to pull in the reverse direction, and in the pulling process, the left end face of the C-shaped pull head 5 contacts and extrudes the triangular lug 12 on one side of the first zipper tooth 6, so that the spring 13 in the through groove 11 is extruded, and the triangular lug 12 is compressed into the through groove 11; the sliding pull head 5 enables the first zipper tooth 6 and the second zipper tooth 7 to be separated, the eye-splice 8 is moved out of the through hole 9, the protective layer 15 is separated, namely, the suitcase is opened, and therefore opening and closing operations of the suitcase are completed.

The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The degradable injection molding zipper comprises a first cloth belt (1), a second cloth belt (2), a bolt (3) and a square block (4), wherein the first cloth belt (1) and the second cloth belt (2) are symmetrically arranged; the square (4) is fixedly connected to the bottom of the first cloth belt (1), and the bolt (3) is fixedly connected to the bottom of the second cloth belt (2); the method is characterized in that: further comprises: a pull head (5) is arranged above the square block (4), the pull head (5) is sleeved on the first cloth belt (1) and is in sliding connection with the first cloth belt (1), locking components for combining the cloth belts are arranged on the inner sides of the first cloth belt (1) and the second cloth belt (2), and the inner shape of the pull head (5) is C-shaped;

the locking assembly includes:

a first element (6); one end of the first zipper tooth (6) is fixedly connected with the first cloth belt (1), and a plurality of first zipper teeth (6) are arranged along the inner side of the first cloth belt (1);

a second element (7); one end of the second zipper tooth (7) is fixedly connected with the second cloth belt (2), and a plurality of second zipper teeth (7) are arranged along the inner side of the second cloth belt (2);

a buckle (8); the eye-splice (8) is arranged on the second cloth belt (2), and the eye-splice (8) penetrates through the second chain tooth (7) and is in sliding connection with the second chain tooth (7);

a through hole (9); the through hole (9) is formed in the first chain tooth (6);

the eye-splice (8) is also provided with an elastic component; the elastic assembly further comprises:

an elastic plate (11); one end of the elastic plate (11) is fixedly connected with the eye-splice (8);

a triangular bump (12); the triangular convex blocks (12) are fixedly connected with the elastic plate (11).

2. A degradable injection molded zipper as claimed in claim 1, wherein: and a chamfer is arranged at the end part of the through hole (9).

3. A degradable injection molded zipper as claimed in claim 2, wherein: one end of the second chain tooth (7) far away from the second cloth belt (2) is provided with a groove (13); one end of the first chain tooth (6) far away from the first cloth belt (1) is fixedly connected with a bump (14).

4. A degradable injection molded zipper as claimed in claim 3, wherein: the protective layers (15) are fixedly connected to the upper surfaces of the first cloth belt (1) and the second cloth belt (2), and the number of the protective layers (15) is more than one.

5. A degradable injection molded zipper as claimed in claim 4, wherein: two protection layers (15) are fixedly connected with magnets (16), and the shapes of the magnets (16) are respectively hemispherical and semi-arc.

6. A degradable injection molded zipper as claimed in claim 5, wherein: rubber (17) is fixedly connected to the surface of the protruding block (14).

7. A degradable injection molded zipper as claimed in claim 6, wherein: the angle tip of the triangular convex block (12) is arc-shaped.

8. A method for preparing a degradable zipper, which is applicable to the zipper composition of any one of the above claims 1 to 7, and is characterized in that: the pull head, the first zipper tooth, the second zipper tooth, the eye-splice, the triangular lug and the lug are all made of PLA composite melting resin;

step S2: introducing the melted PLA composite melting resin into an injection molding machine, injecting the PLA composite melting resin into a die of a pull head, a first chain tooth, a second chain tooth, a buckle, a triangular slide block and a bump by the injection molding machine, and cooling after injection molding is finished to obtain parts of the pull head, the first chain tooth, the second chain tooth, the buckle, the triangular slide block and the bump;